References of "by"

The following context is about this artwork by Bruce Nauman. Does it mean:

The irony of this misalignment of form and content is strengthened by 1. [the pretentiousness of the statement that elevates the artist as a true and gifted individual while expressing this elevation in the form of a cliché] and 2. [the reinforcement of the cliché through the vulgar and commonplace natureof the medium]? I mean do both "by"s refer to "strengthen"?

Context:

The irony of this misalignment of form and content is strengthened by the pretentiousness of the statement that elevates the artist as a true and gifted individual while expressing this elevation in the form of a cliché and by
the reinforcement of the cliché through the vulgar and commonplace natureof the medium.